I do not think this book is on anyone's "must read" list. Written in the 1790's by the German Poet/Playwright Schiller (the guy who wrote the poem Ode To Joy...which ended up as a Choral in later productions of Beethoven's 9th Symphony), it is an extremely well written, well researched history. Schiller explains all the moving parts. What were the motivations, the personal agendas. Its wonderfully done. I highly recommend it. Obviously I read the English translation, but it was very well done.
People today do not fully appreciate the importance of the Thirty-Years War on Western Civilization. Occurring in the mid-1600's in Europe is was the final convulsive conclusion of the Reformation which had begun in the 1500's. The war was brutal, and laid waste to large portions of central Europe. Entire towns were burned to the ground, and the citizens murdered without much thought.
Prior to the Reformation life in Europe was dominated by the Catholic Church. So much so, that politics, governance and the church were really one in the same for most people. Starting in the 1500's the monolithic Catholic control of Europe started to erode. People like Martin Luther, King Henry VIII, John Calvin, etc. had the temerity to question the power of the church.
This lead to upheavals all over Europe known as the Reformation. New Churches, new interpretations of the Bible, and most importantly a splitting of Church and State.
In many ways, the Thirty-Years war was the beginning of the Enlightenment. I know people usually interpret the Enlightenment as the pursuit of science, but it was also a re-examining of the role of the individual in society. One of the biggest issues causing the war was the rights of people, towns, and states to practice the religion of their choice. It forced a realization that the Church and Government had to be separated. You could not have one religion for a state and hope to have any lasting peace. People wanted secular governance and the rights for the individual. If this sounds like what the Constitution of the United States speaks about, you'd be right. Much of the ideas of the founding fathers of the United States come directly from the driving forces of the Thirty Years War. They did not invent these ideas in a vacuum. They'd been killing each other in Europe a hundred years before for the same reasons.
The war took place mainly in what is today Modern Germany, the Czech Republic, and Austria. If you look at the key players (Germany in the form of multiple independent states, Austria, Hungary, France, England (barely), Italy) it feels like a warm-up for the World Wars of the 20th century. Which is not a bad assumption since the results of the war set the stage for the Napoleonic Wars and First World War. Mainly the same actors, dealing with the results of the previous war.
The Thirty Years was was the beginning of the end of imperialism in Europe. The First World War was the end of the end of imperialism in Europe. It took almost 300 years to sort it all out, but ultimately it lead to the modern Europe. Yes, obviously, the Second World War was caused largely by the outcome of the First World War, because Britain and France hadn't got the memo that imperialism was dead. So, they tried to carve up Europe and the Near East between themselves, and stick Germany with the bill.
All in all, a good read if you want to understand this important point in Western History. Keep in mind it was written over 200 years ago, and there are biases, and probably many things that today we would interpret differently. Still, it is a fair account. It is written about 150 years after the end of the war, so there was time for reflection and for documents to surface.
The ending is rather abrupt. The author purposely does not discuss the details of the Peace of Westphalia which ended the war. He leaves that for someone else. Which makes we wonder, was he sick of writing about it, or did he not want to talk about it. I don't know. A curious way to end a book. But, I guess he only wanted to discuss the war and its causes.